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Finding the Fourth Proportional to 1,387.64, 1,914.96 and 828.14

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Solution

The fourth proportional to 1,387.64, 1,914.96 and 828.14 is: 1,142.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.64 : 1,914.96 = 828.14 : x
  2. Step 2: Convert to fraction form
    1,387.64/1,914.96 = 828.14/x
  3. Step 3: Cross multiply
    1,387.64x = 1,914.96 × 828.14
  4. Step 4: Simplify right side
    1,387.64x = 1,585,854.97
  5. Step 5: Solve for x
    x = 1,585,854.97/1,387.64
  6. Step 6: Final answer
    x = 1,142.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.